JPS6133331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition device for a DC circuit or breaker that interrupts a DC circuit without ignition, and is capable of re-igniting a DC circuit after an operation other than manual or automatic ignition. It is related to the device.

Conventionally, as this type of device, one shown in the circuit diagram of FIG. 1 has been used. In other words, in the figure, 1
is the main thyristor that conducts the main circuit current, 2 is the commutation thyristor connected in parallel with main thyristor 1,
3 is an inductance connected in series with the cathode side of the commutation thyristor, and 4 is connected at one end to the inductance 3 and the other end to the cathode side of the main thyristor 1, and is charged with the cathode side of the main thyristor in the positive direction. capacitor, and i ₁ is the main circuit current,
i ₂ represents the discharge current discharged from the capacitor 4 when the commutating thyristor 2 becomes conductive.

Next, FIG. 2 is a simplified block diagram of the above-mentioned conventional ignition device. In the figure, numeral 6 indicates a manual on command unit, 6 indicates a signal from this manual on command unit, and the main thyristor 1 is The gate portion of the main thyristor 1 which outputs the gate signal for making the thyristor conductive is shown.

The main thyristor 1 becomes non-conductive when a reverse voltage is applied, and a manual shearing command signal and a shearing command signal are sent to the gate of the commutation thyristor 2 when the main circuit current _i1 exceeds a certain value. As soon as the voltage is applied, the circuit becomes disconnected.

However, the circuit for giving this shrunken command is not directly related to the present invention and will therefore be omitted.

Next, according to the conventional device having the above configuration, when a gate signal is applied from the manual on command section 5 to the gate section 6 of the main thyristor 1, the main thyristor 1 becomes conductive and the main circuit current _i1 flows. Now, when a manual shutdown command is given or a fault current flows in the main circuit, a gate signal is input to the commutation thyristor 2, and the charge stored in the capacitor 4 is discharged. , a current _i2 flows through the closed circuit of the inductor 3, reversely charging the capacitor 4, and the circuit breaker becomes open, and this open state is maintained until the next manual input command is input to the main thyristor gate section 6. do.

In other words, a series commutation circuit consisting of the commutation thyristor 2, an inductance 3, and a capacitor 4 is configured in both cases of manual or automatic operation, but the main thyristor 1 is connected to the above-mentioned manual or automatic operation or If a reverse voltage is applied due to a factor other than that and the circuit breaker becomes open, the commutation circuit is not configured.

To explain the functional problems of the above-mentioned conventional devices using a practical example, the switching part that conducts the main circuit current of DC and disconnectors is composed of thyristors, and the DC and disconnectors are used for feeder lines of railway substations. When used as a circuit breaker, if a reverse voltage is applied to the main thyristor for longer than the turn-off time of the thyristor element during energization, the main thyristor becomes non-conducting and the running train (hereinafter referred to as load) is Electricity supply becomes impossible. Moreover, the factors that cause the reverse voltage to be applied include regenerative braking, an increase in voltage at an adjacent opposing substation, power supply vibration, etc., and the frequency of occurrence thereof is very high.

However, in the conventional main thyristor ignition device, the ignition signal is sent to the main thyristor only by the operator's manual input command, so it is necessary to issue a manual input command every time the main thyristor is disconnected due to the above-mentioned reverse voltage. Not only is this extremely inefficient, but the operator must constantly monitor the state of the main thyristor, which is practically impossible. Furthermore, when a manual input command is given, it is essential that a forward voltage is applied to the main thyristor, and confirmation of this forward voltage is also required.

The present invention has been made to solve the above-mentioned drawbacks of the conventional ones, and when manual and automatic cut-off is performed, the commutating thyristor, inductance, and capacitor installed in parallel with the main thyristor are Focusing on the formation of a commutation circuit, depending on the presence or absence of current flowing through the commutation circuit,
Distinguishes between manual and automatic shingling operations and shriveling actions caused by regenerative braking, voltage increases in adjacent opposing substations, power supply vibrations, etc., and automatically issues a restriking command in the latter case. The purpose is to provide equipment.

The ignition device for direct current or disconnection according to the present invention can be used in a series commutation circuit when the main thyristor inserted into the main circuit from the power supply to the load and carrying the main circuit current becomes in a non-conductive state while energized. A current detection memory circuit detects, stores and outputs the presence or absence of a current in the main thyristor, and a voltage detection and judgment circuit detects and determines the presence or absence of a forward voltage of the main thyristor. Based on the output signals of these circuits, the main Provided that a voltage is applied to the thyristor in the forward direction and no current flows through the commutation thyristor that is connected in parallel to the main thyristor to form a closed circuit with the main thyristor, the non-conducting state is other than the above-mentioned disconnection. The configuration is such that a logic circuit determines that this is due to the following factors, and outputs a restriking signal to the gate section of the main thyristor.

Hereinafter, one embodiment of the present invention will be explained with reference to the block diagram in FIG. 3 and the circuit diagrams in FIGS. 4 and 5. In FIG. 3, 7 is the forward voltage V _TH1 of the main thyristor 1, and 8 is the The current i ₂ flowing through the commutation circuit,
9 is a memory circuit that stores this current _i2 ; 10 is a negative circuit that outputs 1 when the output signal of memory circuit 9 is 0; 5' is an output circuit that outputs 1 to the gate of main thyristor 1; Manual input command to reset, 11 is undervoltage UV of logic circuit power supply, 12
13 is an undervoltage holding circuit which is a combination of this undervoltage UV11 and the NOT circuit 12, and 14 inputs the outputs of the above circuits and sends a logic output to the main thyristor gate section 6. This is an AND circuit.

Next, in FIG. 4, the same symbols as in FIG. 3 indicate the same parts, and 7' is the main thyristor forward voltage V _T
8' is a _current detection circuit that detects the commutation circuit current i ₂ 8 and sends out a detection signal; 9' is a thyristor used in the memory circuit 9;
5'b is a normally closed contact which is turned off by a manual input command 5' for resetting the memory circuit 9; 15, 16 and 17 are resistors and diodes provided in the AND circuit 14; In addition, the voltage detection circuit 7', the current detection circuit 8', the gate part 6 of the main thyristor, and the undervoltage holding circuit 13 in FIG. They can be regarded as the same, and the re-ignition condition can be detected based on the presence or absence of this connection by using each of the above circuits as a contact configuration.

Furthermore, FIG. 5 shows a circuit diagram in which the forward voltage detection device 7' of FIG. 4 is installed in the conventional DC or disconnector of FIG. One terminal of the resistor 19 is connected to the cathode side of the diode 16, and the other terminal is connected to the cathode side of the thyristor 9'. Resistance 1
The voltage between both terminals of 9 becomes the forward voltage V _TH1 .

Since the ignition device for DC and disconnection according to the present invention is configured as described above, when the main thyristor 1 is in a non-conducting state, V _TH1 is equal to or higher than the voltage V ₀ at point B below, and becomes 0 when the main thyristor 1 is in a conducting state. .

Moreover, when the main thyristor 1 is in a conductive state, V _TH1 =
0, i ₂ =0, so the thyristor 9' is in a non-conducting state. Also, point B has +
A voltage of V ₀ is applied. At this time, resistance 15
A current of ii _G1 flows through the diode 16 in the direction of the arrow. Further, at this time, since the potential at point C is approximately equal to the potential at point A, no current flows through the gate portion 6 of the main thyristor.

Next, when manual or automatic shrunken operation occurs, main thyristor 1 becomes non-conducting and V _TH1 ≦
Since V becomes ₀ and commutation current i ₂ flows, this commutation current
i ₂ is detected by the current detection circuit 8', and the output of the current detection circuit 8' sends a signal to the gate of the thyristor 9', making the thyristor 9' conductive. At this time, a current i _G2 flows through the resistor 15 to the diode 17 and the thyristor 9' in the direction of the arrow. At this time, since the potential at point C is almost equal to that at point A, no current flows through the gate of the main thyristor. Furthermore, while the current detection circuit 8' is detecting the commutation current _i2 , the thyristor 9' maintains the conductive state as a memory circuit 9 by having a current flow through the gate section, and is activated by the next manual input command 5. It is stored that the manual or automatic disconnection has been performed until the normally closed contact 5'b is turned off. When the thyristor 9 is conductive, the current i _G1 does not flow and the current detection circuit 7'
Since the forward voltage V _TH1 is not detected,
A restriking signal is not sent to the main thyristor 1 and the open state is maintained.

Next, when the main thyristor 1 becomes non-conductive due to regenerative braking, an increase in the voltage of the adjacent opposing substation, or power supply vibration, V _TH1 ≧V ₀ and i ₂
= 0, so the thyristor 9' is in a non-conducting state.
At this time, the potential at point C becomes equal to that at point B and becomes +V ₀ . As a result, a current of i _G3 flows through the gate portion 6 of the main thyristor 1 in the direction of the arrow through the resistor 15, and the main thyristor 1 becomes conductive again.

Further, when a reverse voltage is applied to the main thyristor 1, V _TH1 <0 and the current i _G1 continues to flow, so no current flows to the gate portion 6 of the main thyristor 1.

Note that the undervoltage detection circuit 13 is provided as an auxiliary function to ensure that the judgment voltage of the AND circuit 14 described above is the voltage at point B +V ₀ .

As described above, the present invention focuses on the fact that a transfer circuit is formed when a manual or automatic disconnection operation is performed in a DC or disconnection ignition device,
When the main thyristor becomes non-conducting due to a factor other than the manual or automatic cutoff mentioned above and requires re-ignition, the commutation circuit current is detected and stored, and a forward voltage is applied to the main thyristor. After determining that, a logic circuit is configured to send a restriking signal to the main thyristor on the condition that a forward voltage is applied to the main thyristor and no current flows to the commutating thyristor, and the Since the main thyristor can be turned on again at any time, the power supply to the load can be maintained without the operator's monitoring or re-turning command.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the basic configuration of a conventional direct current or disconnector, Fig. 2 is a simplified block diagram of a conventional ignition device, and Fig. 3 is a block diagram showing the ignition device of the present invention. Figure 4 is a circuit diagram showing a specific example of Figure 3, and Figure 5 is a circuit diagram showing a specific example of Figure 3.
The figure is a circuit diagram of the detection device of FIG. 4. 1: Main thyristor, 2: Commutation thyristor,
3: Inductance, 4: Capacitor, 5,
5': Manual input command, 6: Main thyristor gate section,
7: Main thyristor forward voltage, 8: Commutation circuit current, 9: Memory circuit, 10: Negative circuit, 11: Undervoltage, 12: Negative circuit, 13: Foot voltage holding circuit, 1
4: AND circuit, 15: Resistor, 16, 17: Diode, 5'b: Contact, 7': Forward voltage detection judgment circuit, 8': Commutation circuit current detection circuit, 9': Thyristor, 18, 19 : Resistance, i ₁ : Main circuit current, i ₂ :
Commutation circuit current, i _G1 , i _G2 , i _G3 : Current flowing in the logic circuit in each mode. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A main thyristor inserted in the main circuit from the power source to the load to carry the main circuit current, a commutating thyristor connected in parallel to this main thyristor and forming a closed circuit with the main thyristor, a series rotation of an inductance and a capacitor. In the ignition device for a DC or disconnection circuit, the ignition device for a DC or disconnection circuit is configured to discharge the charge accumulated in the capacitor by ignition of the commutation thyristor and cut off the current in the main thyristor.
A current detection memory circuit detects, stores and outputs the presence or absence of current in the series commutation circuit when the main thyristor becomes non-conductive while being energized, and detects and determines the presence or absence of forward voltage of the main thyristor. and a voltage detection judgment circuit that operates, and a voltage is applied in the forward direction to the main thyristor based on the output signals of these circuits, and on condition that no current flows to the commutating thyristor, the non-conducting state is other than the above-mentioned disconnection. A DC or disconnection ignition device characterized by comprising a logic circuit that determines that the ignition is caused by the following factors and outputs a re-ignition signal to the gate section of the main thyristor.